TY - JOUR
T1 - Investigating the dislocation reactions on Σ3{111} twin boundary during deformation twin nucleation process in an ultrafine-grained high-manganese steel
AU - Hung, Chang Yu
AU - Shimokawa, Tomotsugu
AU - Bai, Yu
AU - Tsuji, Nobuhiro
AU - Murayama, Mitsuhiro
N1 - Funding Information:
This study was partly supported by Nanoscale Characterization and Fabrication Laboratory (NCFL), Institute for Critical Technology and Applied Science (ICTAS), Virginia Tech and used shared facilities at the Virginia Tech National Center for Earth and Environmental Nanotechnology Infrastructure (NanoEarth), a member of the National Nanotechnology Coordinated Infrastructure (NNCI), supported by NSF (ECCS 1542100, ECCS 2025151). N.T., T.S. and M.M. greatly appreciate the financial support by the JST CREST (JPMJCR1994). M.M. acknowledges a financial support by the DOE Basic Energy Science Program (BES DE-FG02-06ER15786) for technical development of TEM in-situ deformation, and JSPS KAKENHI Grant Numbers (No. 19H02029, 20H02479). N.T. acknowledges a financial support by Elements Strategy Initiative for Structural Materials (ESISM, No. JPMXP0112101000), and JSPS KAKENHI (No. 15H05767, No. 20H00306), all through the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12
Y1 - 2021/12
N2 - Some of ultrafine-grained (UFG) metals including UFG twinning induced plasticity (TWIP) steels have been found to overcome the paradox of strength and ductility in metals benefiting from their unique deformation modes. Here, this study provides insights into the atomistic process of deformation twin nucleation at Σ3{111} twin boundaries, the dominant type of grain boundary in this UFG high manganese TWIP steel. In response to the applied tensile stresses, grain boundary sliding takes place which changes the structure of coherent Σ3{111} twin boundary from atomistically smooth to partly defective. High resolution transmission electron microscopy demonstrates that the formation of disconnection on Σ3{111} twin boundaries is associated with the motion of Shockley partial dislocations on the boundaries. The twin boundary disconnections act as preferential nucleation sites for deformation twin that is a characteristic difference from the coarse-grained counterpart, and is likely correlated with the lethargy of grain interior dislocation activities, frequently seen in UFG metals. The deformation twin nucleation behavior will be discussed based on in-situ TEM deformation experiments and nanoscale strain distribution analyses results.
AB - Some of ultrafine-grained (UFG) metals including UFG twinning induced plasticity (TWIP) steels have been found to overcome the paradox of strength and ductility in metals benefiting from their unique deformation modes. Here, this study provides insights into the atomistic process of deformation twin nucleation at Σ3{111} twin boundaries, the dominant type of grain boundary in this UFG high manganese TWIP steel. In response to the applied tensile stresses, grain boundary sliding takes place which changes the structure of coherent Σ3{111} twin boundary from atomistically smooth to partly defective. High resolution transmission electron microscopy demonstrates that the formation of disconnection on Σ3{111} twin boundaries is associated with the motion of Shockley partial dislocations on the boundaries. The twin boundary disconnections act as preferential nucleation sites for deformation twin that is a characteristic difference from the coarse-grained counterpart, and is likely correlated with the lethargy of grain interior dislocation activities, frequently seen in UFG metals. The deformation twin nucleation behavior will be discussed based on in-situ TEM deformation experiments and nanoscale strain distribution analyses results.
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U2 - 10.1038/s41598-021-98875-z
DO - 10.1038/s41598-021-98875-z
M3 - Article
C2 - 34588568
AN - SCOPUS:85116351620
VL - 11
JO - Scientific Reports
JF - Scientific Reports
SN - 2045-2322
IS - 1
M1 - 19298
ER -